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Rock star to the doctor last fall. crow's team tells abc news the singer was concerned by pressure she felt on her temple. the mri diagnosis? a benign brain tumor called meningioma. no one knows what causes the tumor. still, as many as 10,000 americans are diagnosed with one each year. over 90% of the cases are non-cancerous. >> they're more common in women than men. and they typically arise in older people, between 40 and 70 years old. >> reporter: most of the time the tumors grow slowly. that's why many doctors recommend leaving and monitoring them. they're always found in the tissue surroun...

Rock star to the doctor last fall. crow's team tells abc news the singer was concerned by pressure she felt on her temple. the mri diagnosis? a benign brain tumor called meningioma. no one knows what causes the tumor. still, as many as 10,000 americans are diagnosed with one each year. over 90% of the cases are non-cancerous. >> they're more common in women than men. and they typically arise in older people, between 40 and 70 years old. >> reporter: most of the time the tumors grow slowly. that's why many doctors recommend leaving and monitoring them. they're always found in the tissue surroun...